[Pavlovia] Display doesn't update fast enough when changing to some Routines

PsychoPy has to do extra stuff at the start of a loop. This shouldn’t be a problem if:

  1. The first routine in the loop is an ITI.
  2. There are lots of trials (only the first should be affected).

This does mean that loops are not great for RSVP (rapid serial visual presentation). For an alternative have a look at my RSVP online demo PsychoPy Online Demos